A DC to AC inverter in which a composite waveform synthesizing a sinusoidal waveform and having three incremental steps for each quarter cycle is formed by summing an alternating stepped waveform having three steps for half cycle, with a square wave in phase therewith and having a frequency three times...http://www.google.fr/patents/US4063144?utm_source=gb-gplus-shareBrevet US4063144 - Inverter for providing a sinusodial output having a low harmonic content
Inverter for providing a sinusodial output having a low harmonic content
